SSAT Elementary Level Math : Plane Geometry

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

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Example Questions

Example Question #11 : Triangles

A triangle has base of length \displaystyle 6 units and a height of length \displaystyle 8 units. What is the area of this triangle?

Possible Answers:

\displaystyle 24 units squared

\displaystyle 14 units squared

\displaystyle 20 units squared

\displaystyle 15 units squared

\displaystyle 8 units squared

Correct answer:

\displaystyle 24 units squared

Explanation:

To calculate the area of a triangle, you use the formula \displaystyle \frac{1}{2}\cdot b\cdot h, where \displaystyle b is the length of the base of the triangle and \displaystyle h is the height of the triangle. For this triangle, we need to solve the equation \displaystyle \frac{1}{2}\cdot 6 \cdot 8 to find its area. \displaystyle 6\cdot 8=48 and \displaystyle 48\div2=24, so the triangle's area is \displaystyle 24 units squared.

Example Question #12 : Triangles

The base of a triangle is \displaystyle 12, and the height is \displaystyle 20.  What is the area of the triangle?

Possible Answers:

\displaystyle 60

\displaystyle 120

\displaystyle 75

\displaystyle 240

\displaystyle 180

Correct answer:

\displaystyle 120

Explanation:

Write the formula for area of a triangle.  Substitute the dimensions.

\displaystyle A=\frac{bh}{2} = \frac{(12)(20)}{2} = 12(10)=120

Example Question #13 : Triangles

If the base and height of a triangle is one, what is the area?

Possible Answers:

\displaystyle \frac{1}{4}

\displaystyle \frac{1}{2}

\displaystyle 2

\displaystyle \frac{1}{3}

\displaystyle 1

Correct answer:

\displaystyle \frac{1}{2}

Explanation:

Write the formula for the area of a triangle.

\displaystyle A=\frac{1}{2} (B\times H)

Substitute the base and height to find the area.

\displaystyle A=\frac{1}{2} (1\times 1) = \frac{1}{2}

Example Question #14 : Triangles

What is the area of the triangle in the figure?

Screen_shot_2014-01-31_at_4.06.32_pm

Possible Answers:

\displaystyle 250 cm^2

\displaystyle 300 cm^2

\displaystyle 600 cm^2

\displaystyle 100 cm^2

\displaystyle 150 cm^2

Correct answer:

\displaystyle 150 cm^2

Explanation:

Because the question asks you to find the AREA of the triangle, you are looking to figure out how much space the triangle covers. You find the area of triangles by multiplying the height of the triangle times the base and dividing by \displaystyle 2. So \displaystyle A = 1/2 \times B \times H, or \displaystyle A = 10 \: cm \times 30 \: cm \times 1/2. Therefore the correct answer is \displaystyle 150 cm^2

Example Question #13 : How To Find The Area Of A Triangle

The base of a triangle is \displaystyle 8 and the height of the triangle is \displaystyle 3.  What is the area of the triangle?

Possible Answers:

\displaystyle 24

\displaystyle 12\sqrt2

\displaystyle 12

\displaystyle \frac{\sqrt{6}}{2}

\displaystyle 2\sqrt6

Correct answer:

\displaystyle 12

Explanation:

Write the formula for the area of a triangle.

Substitute the base and height into the formula.

\displaystyle A= \frac{1}{2} (8)(3) = 12

Example Question #15 : Triangles

Find the area of a triangle whose base is 6 and height is 7.

Possible Answers:

\displaystyle 26

\displaystyle 42

\displaystyle 13

\displaystyle 21

Correct answer:

\displaystyle 21

Explanation:

To solve, simply use the formula for the area of a triangle.

\displaystyle A=\frac{1}{2}Bh=\frac{1}{2}(7)(6)=\frac{42}{2}=21

Example Question #16 : Triangles

Find the area of a triangle whose base length is 8 and height is 4.

Possible Answers:

\displaystyle 16

\displaystyle 14

\displaystyle 32

\displaystyle 24

Correct answer:

\displaystyle 16

Explanation:

To find area of a triangle, simply use the formula below:

\displaystyle A=\frac{1}{2}Bh=\frac{1}{2}(8)(4)=16

Example Question #17 : Triangles

Find the area of a triangle whose base is 8 and height is 3.

Possible Answers:

\displaystyle 12

\displaystyle 11

\displaystyle 22

\displaystyle 24

Correct answer:

\displaystyle 12

Explanation:

To solve, simply use the formula for the area of a triangle. Thus,

\displaystyle A=\frac{1}{2}Bh=\frac{1}{2}*8*3=12

Example Question #1 : Geometry

Why is this shape NOT a triangle? 

Screen shot 2015 07 21 at 2.45.18 pm

Possible Answers:

Because it is blue

Because it is flat

Because it does not have \displaystyle 3 sides

Because it does have \displaystyle 3 sides

 Because it is not a closed shape

Correct answer:

Because it does not have \displaystyle 3 sides

Explanation:

A triangle has \displaystyle 3 sides, and this shape has \displaystyle 4.

Example Question #601 : Plane Geometry

If you need to find the area of a given triangle, what information do you need to solve for the area?

Possible Answers:

The length of all three sides

The height

The base

The length of two sides

The base and height

Correct answer:

The base and height

Explanation:

The equation for area of a triangle is \displaystyle \frac{1}{2} * b *h, so you need to know the base length of the traingle and also the height.

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