Question

<1 and <2 are complementary angles. The measure of <1 is 51 degrees. The measure of <2 is 3x. Find the value of x.

Answer 1

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☑ Complementary angles means sum of any pair of angles which measures 90°.

Now... Let the unknown value of angle be x°.

Therefore,

✍ x° + 51° = 90°

✍ x = 90° - 51°

✍ x = 39°

Hence, The value of unknown angle is 39°.