12. Find the measure of the largest angle in the triangle shown.

Step-by-step explanation:

all angles of a triangle sum to 180

180 = 15x + 24x +21x

180=60x

solve for x

then substitute that for 24(x) to get the angle

Hello! 72

Step-by-step explanation:

the largest angle is 24 × 3 = 72 because 21 × 3 = 63 is less and 15 × 3 = 45 is less and x = 3

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