Triangle DEF is shown below. What is the measure of ∠D?

Question
Triangle DEF is shown below. What is the measure of \(\displaystyle∠{D}\)?

Answers (1)

2021-01-11
The sum of the angle measures of a triangle is 180°. So, we write:
\(\displaystyle{m}∠{D}+{m}∠{E}+{m}∠{F}={180}°\)
\(\displaystyle{m}∠{D}+{57}°+{39}°={180}°\)
\(\displaystyle{m}∠{D}+{96}°={180}°\)
\(\displaystyle{m}∠{D}={84}°\)
0

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