Question

Construct atriangle ABC in which angleBn=90degree and AB=4 cm andBC=3 cm

Answer 1

first draw base bc of 3cm with your scale. Then take a protractor and mark 90 degree from point b.Take a rounder and make an arc of 4cm from both b and c then you will have the isosceles triangle.

Answer 2

using the formula of hypotenuse
${ac}^{2} = {ab}^{2} + {bc}^{2} \\ {ac}^{2} = {4}^{2} + {3}^{2} \\ {ac}^{2} = 16 + 9 \\ {ac}^{2} = 25 \\ ac = \sqrt{25} \\ ac = 5$
you can find the third side it would make your work easier