SSAT Elementary Level Math : Plane Geometry

Study concepts, example questions & explanations for SSAT Elementary Level Math

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Example Questions

Example Question #591 : Geometry

What is the area of a triangle with a base of 11 and a height of 4?

Possible Answers:

14

60

22

44

6

Correct answer:

22

Explanation:

The formula to find the area of a triangle is \(\displaystyle \frac{base \cdot height}{2}\). First, we should multiply 11 (base) x 4 (height), to get a total of 44. Next, we need to divide 44 by 2, which gives us a total area of 22.

Example Question #3 : How To Find The Area Of A Triangle

You can find the area of a triangle if you know ___________.

Possible Answers:

the height and base

the perimeter

two side lengths

its angles

Correct answer:

the height and base

Explanation:

\(\displaystyle Area _{\Delta } = \frac{1}{2}\times base \times height\)

Example Question #591 : Plane Geometry

Squareslice

The square shown above has a side length of 3 and is divided into two triangles by its diagonal. What is the area of one of the triangles?

Possible Answers:

\(\displaystyle 4.5\)

\(\displaystyle 12.25\)

\(\displaystyle 9\)

\(\displaystyle 6.5\)

Correct answer:

\(\displaystyle 4.5\)

Explanation:

The area of the square is side times side, \(\displaystyle 3\times3=9\).

Each triangle is half of the square, \(\displaystyle 9\div2=4.5\).

Example Question #5 : How To Find The Area Of A Triangle

Screen_shot_2014-01-10_at_1.07.49_pm

What is the area of the triangle?

Possible Answers:

\(\displaystyle 20\)

\(\displaystyle 12\)

\(\displaystyle 4\)

\(\displaystyle 6\)

\(\displaystyle 13\)

Correct answer:

\(\displaystyle 6\)

Explanation:

The formula to find the area of a triangle is 

\(\displaystyle \frac{base \times height}{2}\)

First, we should multiply \(\displaystyle 3\) (base) \(\displaystyle \times\) \(\displaystyle 4\) (height), to get a total of \(\displaystyle 12\).

Next, we need to divide \(\displaystyle 12\) by \(\displaystyle 2\), which gives us a total area of \(\displaystyle 6\)

Example Question #592 : Plane Geometry

An isosceles triangle has a base of 12 cm and a height of 6 cm. What is the area of the triangle?

Possible Answers:

\(\displaystyle 36\: cm^{2}\)

\(\displaystyle 12\: cm^{2}\)

\(\displaystyle 18\, cm^{2}\)

\(\displaystyle 72\: cm^{2}\)

Correct answer:

\(\displaystyle 36\: cm^{2}\)

Explanation:

To find the area of a triangle, you must multiply \(\displaystyle \frac{1}{2}\) by the base (12 cm) by the height (6 cm):

\(\displaystyle \frac{12\: cm}{2}\times6 \: cm=36\: cm^{2}\)

Therefore the area of this triangle is \(\displaystyle 36\: cm^{2}\).

Example Question #593 : Plane Geometry

A triangle has a base of 14 and a height of 8. What is the area of the triangle?

Possible Answers:

\(\displaystyle 22\)

\(\displaystyle 56\)

\(\displaystyle 58\)

\(\displaystyle 112\)

\(\displaystyle 57\)

Correct answer:

\(\displaystyle 56\)

Explanation:

To find the area of a triangle, multiply the base (14) by the height (8) and divide by 2:

\(\displaystyle \frac{14}{2}\times8=56\)

Therefore the area of this triangle is \(\displaystyle 56\).

 

Example Question #595 : Geometry

Screen_shot_2014-01-06_at_12.34.19_pm

What is the area of the triangle?

Possible Answers:

60

24

48

28

30

Correct answer:

24

Explanation:

The formula to find the area of a triangle is \(\displaystyle \frac{base \times height}{2}\).

\(\displaystyle A = \frac{6\times 8}{2}=24\)

Example Question #6 : How To Find The Area Of A Triangle

If a triangle has a base of 3 inches and a height of 8 inches, what is the area of the triangle?

Possible Answers:

\(\displaystyle 16\;in^2\)

 

 

\(\displaystyle 12\;in^{2}\)

\(\displaystyle 32\;in^2\)

\(\displaystyle 11\;in^2\)

\(\displaystyle 24\;in^2\)

Correct answer:

\(\displaystyle 12\;in^{2}\)

Explanation:

The formula for the area of a triangle is  \(\displaystyle \frac{1}{2} \times base \times height= area\).

Plug in the values given to solve the equation:  

\(\displaystyle \frac{1}{2}(3\;in)(8\;in)=\) 

 

\(\displaystyle \frac{1}{2}\times 3\;in \times 8\;in = \frac{1}{2}\;\times24\;in^{2}=12\;in^2\)

 

Example Question #7 : How To Find The Area Of A Triangle

A triangle has a base of 10 centimeters and a height of 12 centimeters. What is the area of the triangle?

Possible Answers:

\(\displaystyle 120\ cm^{2}\)

\(\displaystyle 22\ cm^{2}\)

\(\displaystyle 60\ cm^{2}\)

 

\(\displaystyle 70\ cm^{2}\)

\(\displaystyle 72\ cm^{2}\)

Correct answer:

\(\displaystyle 60\ cm^{2}\)

 

Explanation:

The formula for the area of a triangle is \(\displaystyle area=\frac{1}{2}(base)(height)\).

Plug in the given values to solve for the area:

\(\displaystyle \frac{1}{2}\times10cm\times12cm\)

 = \(\displaystyle 5cm\times12cm\)

 = \(\displaystyle 60cm^2\) 

The area of this triangle is \(\displaystyle 60cm^{2}\).

Example Question #11 : How To Find The Area Of A Triangle

What is the area of a right triangle with a base of length 4 and a height that is 3 times longer than the base?

Possible Answers:

\(\displaystyle 24\)

\(\displaystyle 48\)

\(\displaystyle 36\)

\(\displaystyle 12\)

\(\displaystyle 6\)

Correct answer:

\(\displaystyle 24\)

Explanation:

The area of a triangle is given by the formula \(\displaystyle A = \frac{1}{2}\times b \times h\), where \(\displaystyle b\) is the length of the base and \(\displaystyle h\) is the height.

First let's figure out the height. The base is 4, and the height is 3 times greater than the base:

\(\displaystyle 3 \times 4 = 12\)

Now plug the base and height into the area formula:

\(\displaystyle A = 0.5 \times 4 \times 12 = 2 \times 12 = 24\)

 

The area of the triangle is 24.

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