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Angle A is 30 degrees and angle D is arccos(3/5)

 Jul 12, 2021
 #1
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The area of triangle ABC is 5*sqrt(3), and the area of triangle DEF is 9.

 Jul 12, 2021
 #2
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Height    BX = sinA * 4 = 2

[ABC] = 1/2(2 * 5) = 5

 

Height     EY = sinD * 4 = 3.2

[DEF] = 1/2(3.2 * 5) = 8

 Jul 12, 2021

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