19.8k views
3 votes
Two exterior angles of a triangle equal 100° and 150°. Find all the interior angles.

User SaphuA
by
8.2k points

1 Answer

7 votes

Answer:

The interior angles for this triangle are 80º, 30º and 70º.

Explanation:

The sum of a interior angle with it's respective exterior angle is also always 180º.

So, for the exterior angle that is 100º, we can find the first interior angle of the triangle

100º + A1 = 180º

A1 = 180º - 100º

A1 = 80º

The first interior angle of this triangle is A1 = 80º;

For the exterior angle that is 150º, we can find the second interior angle of the triangle.

150º + A2 = 180º

A2 = 180º - 150º

A2 = 30º

The second interior angle of this triangle is A2 = 30º.

From here, to find the third interior angle, we apply the following definition

The sum of the three interior angles of a triangle is always 180º.

So:

A1 + A2 + A3 = 180º

80º + 30º + A3 = 180º

110º + A3 = 180º

A3 = 180º - 110º

A3 = 70º

The third interior angle of this triangle is A3 = 70º.

The interior angles for this triangle are 80º, 30º and 70º.

User Ahmkara
by
8.3k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories