Question

Consider the triangle. 45° 80° Find the measure of the unknown third angle.

Answer 1

Answer:

55

Step-by-step explanation:

• Since the sum of all angles in the triangle = 180°
• Since the sum of two angles in the triangle =45°+80°= 125°
• Then measure of the third angle = sum of all angles of triangle - the sum of two angles in the triangle = 180° - 125° = 55°

Answer 2

Answer:

$55 \degree$

Step-by-step explanation:

Let the unknown angle be x

As the interior angles in a triangle are added up to 180°

$x + 45 + 80 = 180 \\ x + 125 = 180 \\ x = 180 - 125 \\ x = 55 \degree$

Hope this helps you.

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