Question

Can any one help me,I can't understand

Answer 1

Step-by-step explanation:

1. area of rectangle = length × breadth

$\boxed{ \bold \pink{area \: of \: rectangle \: = \: 4cm \times 8cm = 32 {cm}^{2} }}$

2. Refer the attached file first before proceeding .

We can see we are getting a right angled triangle . and we know the other two sides of the triangle . here is the place where pythagorus theorem come to our rescue .

we are assuming hypotenuse = diagonal

$\bold{acc. \: to \: pythagoras \: theorem : } \\ {base}^{2} + {perpendicular}^{2} = {hypotenuse}^{2}$

${8}^{2} + {4}^{2} = {h}^{2}$

$48 + 16 = 64$

${h}^{2} = 64$

$h \: = \sqrt{64} \\ h = 8$

diagonal = 8cm