exam Maths Puzzle Numerical Ability

given: triangle AFE is congruent to triangle BFC

prove: triangle DEF is congruent to DCF
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exam Other Question

This is a Pythagoreans Therom problem.

A right triangle has one leg that is 5cm longer than the other leg. The hypotenuse is 25cm long. Find the length of each leg of the triangle.
Two problems... but only need one solution!
First part. A rectangular piece of metal is 10 in. longer than it is wide. Squares with sides 2 in. long are cut from the four corners,