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The triangular base of the given prism has an interior angle with a measure of 80° and an interior angle with a measure of 55°. What is the measure of the unknown angle?

A. 45°
B. 65°
C. 75°
D. 85°

User Ian Christian Myers
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1 Answer

17 votes
17 votes

Answer:

A. 45°

Explanation:

When we are given two measurements of interior angles we add both of those angles together.

Also know that a triangle equals 180 degrees

So when we write out this expression
80+55+x=180


135+x=180\\-135=-135\\x=45

Hope this helps

User Mechenbier
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2.6k points