What us the area of the triangle abcd?

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1 Answer
Lucy
Jun 9, 2018

#15.75# is the area of the rectangle

Explanation:

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 #

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