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ABCD is a rectangle. Δ ADE and Δ ABF are two triangles such that ∠E=∠F as shown in the figure. Prove that AD x AF=AE x AB.
Ans: Consider Δ ADE and Δ ABF
∠D = ∠B = 90o
∠E = ∠F (given)
∴Δ ADE ≅ Δ ABF
AD/AB = AE/AF
⇒ AD x AF = AB x AE Proved
Describe and sketch the surfaces z + |y| = 1 and (x 2) 2 y + z 2 = 0.
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