#### A right triangle has one other angle that is 35°. What is the size of the third angle?

Anonymous

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Anonymous

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Krishna

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Step 1: Recall the right angle triangle properties.

NOTE; A right triangle has one angle = 90°.

Step 2: Add the known angles.

EXAMPLE: 90° + 35° = 125°.

Step 3: Calculate the unknown angle by the sum of the interior angle theorem.

NOTE: The sum of all the angles in any triangle is 180°.

EXAMPLE: Subtract sum of known angles from 180°.

180° − 125° = 55°

Answer: The size of the third angle is 55°