Leah is an interior designer. she will use the scale drawing shown of two bedrooms and a shared bathroom to create her designs for her client.

what are the dimensions of the outer rectangle in leah’s scale drawing?
a. 3 3/8 inches × 5 5/8 inches
b. 5 5/8 inches × 9 inches
c. 6 3/4 inches × 5 5/8 inches
d. 15 inches × 24 inches

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step-by-step explanation:

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°.