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2 years ago

Matching equations with diagrams & finding unknown angles #3

Mathematics

1 answer:

Illusion [34]2 years ago

8 0

Answer: a+51=90, a+51+90=180, 39

Step-by-step explanation:

a+51=90 works because the angles add to form a right angle.

a+51=180 does not work because the angles add to form a right angle, not a straight angle.

a+51+90=180 works because all those angles add to form a straight angle.

a+90=180 does not work because the unknown in this situation refers to a+51, not just a.

Solving the equation, we get a=39, so 39 is also an answer.

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3 years ago

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Step-by-step explanation:

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