What us the area of the triangle abcd?

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Answer 1 · 2018-06-09T08:27:31

$15.75$ is the area of the rectangle

A property of the rectangle is that its interior angles is equal to $90$ degrees

Therefore, using the sin and cos ratios,

$sin 70="AD"/"AC"$

$AD=ACsin70$

$AD=7sin70$

$cos70="DC"/"AC"$

$DC=7cos70$

Area of the rectangle is ABCD = $DC times AD$ = $7cos70times7sin70 =15.75$