Question

Solve the equation
$\frac{1}{v1} - \frac{1}{u} = \frac{1}{f1} + \frac{1}{v} - \frac{1}{v1} = \frac{1}{f2}$
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Answer 1

Answer:

monke

Explanation:

∠C=4x=4×20∘=80∘ The angles of a triangle are in the ratio 2 : 3 : 4.