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February 1st, 2017, 08:07 AM   #1
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Post Two 3-D Trigo Geometry Problems without using vector or coordinate geometry

Q3
In the figure, VPQRS is a right pyramid with a rectangle base of sides 6 cm and 8 cm. The length of each slant edge is 7 cm. Find the angle between the planes VQR and VRS.



Q4
The figure shows a triangular pyramid VABC with AC=VB=6 cm, BC=9 cm, angle BVC = angle BAC =80. It is given that triangles ABC and VCB are congruent and the angle between the planes VBC and VBA is 70 degree. Find angle VBA and the angle between planes ABC and VBA.

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