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High School Math : How to find the area of an acute / obtuse triangle

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Example Questions

Example Question #31 : Acute / Obtuse Triangles

Find the area of a triangle whose base is 14in and whose height is 2ft .

Possible Answers:

$196in^{2}$

$168in^{2}$

$336in ^{2}$

$186in^{2}$

$136in^{2}$

Correct answer:

$168in^{2}$

Explanation:

This problem is solved using the geometric formula for the area of a triangle.

$A=\frac{1}{2}b*h$

Convert feet to inches.

$\dpi{100} \frac{2ft}{1}*\frac{12in}{1ft}=24in$

$A=\frac{1}{2}*14in*24in$

$A=168in^{2}$

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Example Question #252 : Plane Geometry

If triangle ABC has vertices (0, 0), (6, 0), and (2, 3) in the xy-plane, what is the area of ABC?

Possible Answers:

Correct answer:

Explanation:

Sketching ABC in the xy-plane, as pictured here, we see that it has base 6 and height 3. Since the formula for the area of a triangle is 1/2 * base * height, the area of ABC is 1/2 * 6 * 3 = 9.

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Example Question #61 : Triangles

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

Possible Answers:

Correct answer:

Explanation:

When searching for the area of a triangle we are looking for the amount of the space enclosed by the triangle.

The equation for area of a triangle is

Plug the values for base and height into the equation yielding

$\frac{1}{2}(4)(7)=Area$

Then multiply the numbers together to arrive at the answer .

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Example Question #1 : How To Find The Area Of An Acute / Obtuse Triangle

The height, , of triangle PQR in the figure is one-fourth the length of . In terms of h, what is the area of triangle PQR ?

Possible Answers:

$2h^{2}$

$3h^{2}$

$h^{2}$

$\frac{1}{2}h^{2}$

Correct answer:

$2h^{2}$

Explanation:

If $\dpi{100} \small h=\frac{1}{4}$ * $\dpi{100} \small \overline{PQ}$ , then the length of $\dpi{100} \small \overline{PQ}$ must be $\dpi{100} \small 4h$ .

Using the formula for the area of a triangle ( $\frac{1}{2}bh$ ), with $\dpi{100} \small b=4h$ , the area of the triangle must be $2h^{2}$ .

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High School Math : How to find the area of an acute / obtuse triangle

Study concepts, example questions & explanations for High School Math

All High School Math Resources

Example Questions

Example Question #31 : Acute / Obtuse Triangles

Example Question #252 : Plane Geometry

Example Question #61 : Triangles

Example Question #1 : How To Find The Area Of An Acute / Obtuse Triangle

All High School Math Resources

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