Topics
8. Triangle Trigonometry
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United States of America
Grades 9-12

8.07 Area of triangles

Lesson
Practice
Adaptive
Worksheet

Interactive practice questions

Calculate the area of the following triangle.

Round your answer to two decimal places.

A triangle is depicted with the measurements of its two sides and their included angle. The included angle, highlighted by a blue-shaded arc, measures $50^\circ$50° and is adjacent to sides measuring $12$12 m and $13.1$13.1 m.
Medium
2 min

Calculate the area of the following triangle.

Round your answer to two decimal places.

Medium
1 min

Calculate the area of the triangle.

Round your answer to two decimal places.

Medium
< 1 min

Calculate the area of the triangle.

Round your answer to two decimal places.

Medium
< 1 min
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Outcomes

HSG.SRT.D.9 (+)

Derive the formula a = 1/2 ab sin(c) for the area of a triangle by drawing an auxiliary line from a vertex perpendicular to the opposite side.

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