exam Maths Puzzle Numerical Ability

i have a right triangle with a circle inside. the height is 3 and the base is 4. the long diagonal side is 5. i need to know what the radius of the circle is?

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exam Other Question

A boy is flying a kite and is standing 30ft from a point directly under the kite. If the string to the kite is 50 feet long, find the angle of the elevation of the kite. x^2+5x+4/(x+3)^2 Divide by x+1/x^2-9