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alexandr1967 [171]
3 years ago
7

Drag an answer to each box to complete this paragraph proof.

Mathematics
2 answers:
Alexxx [7]3 years ago
8 0

1st box:

m<A + m<B + m<C = 180


2nd box:

substitution property


3rd box:

division property of equality


Hope it helps.

shtirl [24]3 years ago
4 0

Answer:

Step-by-step explanation:

By the triangle sum theorem, the sum of angles in a triangle is equal to 180°. Therefore  m∠A + m∠B + m∠C = 180  using the Substitution property (3x)° + 90° + (x+10)° = 180° To solve for x, first combine like terms to get 4x + 100 = 180, using the subtraction property of equality, 4x = 80 using the Division property of equality,  x = 20. To find the measure of the angle A, use the substitution property to get m∠A = 3(20)°. Finally simplify the expression gets m∠A = 60°

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