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Monica needs a piece of wood that is exactly 9.185 feet long for her project. She went to the store and bought
one that was 10.5 feet long.
How much wood does Monica need to cut off?
O 1.315 feet
O 9.185 feet
O 19.685 feet
O I don't know.
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Nelie

1.315

Step-by-step explanation:

10.5 - 9.185 = 1.315

1. 180°. the sum of the interior angles of a triangle is 180°, for the equilateral triangle that it has three equals side is 60°+60°+60°=180°.

2. 60°. each interior angle of a equilateral triangle is 60°

3. 120°. the measure of ∠m is 120°, the sum of the angles ∠m and ∠n is equal to 180°. so, in order to find the measure of ∠m, we have ∠m+∠n=180° > ∠m=180°-∠n > ∠m=180°-60°=120°.

4. 360°. the sum of the exterior angles of an equilateral triangle is ∠m+∠r+∠x=120°+120°+120°=360°. the exterior angles of any triangle always add 360°.