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Triangle Angles and Sine Law

Triangle Angles and Sine Law

Assessment

Interactive Video

Mathematics

9th - 10th Grade

Practice Problem

Hard

Created by

Thomas White

FREE Resource

The video tutorial demonstrates how to find missing angles in a triangle using the law of sines. The process begins by calculating angle beta, followed by using the sum of angles in a triangle to determine angle alpha. The tutorial includes step-by-step calculations and emphasizes rounding to the nearest degree. It concludes with a brief mention of alternative methods for finding missing lengths.

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15 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What mathematical law is used to find missing angles in this tutorial?

Law of Sines

Pythagorean Theorem

Law of Tangents

Law of Cosines

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the first angle given in the problem?

30 degrees

25 degrees

20 degrees

15 degrees

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the first step in finding angle alpha?

Calculate angle gamma

Directly calculate angle alpha

Find angle beta

Use the Law of Cosines

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the given side length opposite angle B?

5.2

4.1

6.3

3.8

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the sine of 25 degrees approximately?

0.3

0.6

0.42

0.5

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What operation is performed after finding sine of B?

Multiply by 3.8

Subtract from 180

Add 25 degrees

Take the inverse sine

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the approximate value of sine of B after calculation?

0.456

0.567

0.678

0.789

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