If a perpendicular drawn from an obtuse-angeld vertex of a rhombus to the opposite side of bisect the side, find all angles of the rhombus
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Let the acute angle be A and obtuse angle be B.
Rhombus ABCD, and angle A = angle C = acute angles.
The perpendicular from B to AD be BE.
Now in ABE, AE = ED = AB/2 = AD/2
cos A = AE/AB = 1/2
angle A = 600 = angle C
angle B = angle D = (360 - 2x60)/2 = 120.
Rhombus ABCD, and angle A = angle C = acute angles.
The perpendicular from B to AD be BE.
Now in ABE, AE = ED = AB/2 = AD/2
cos A = AE/AB = 1/2
angle A = 600 = angle C
angle B = angle D = (360 - 2x60)/2 = 120.
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