Figure cdef is a parallelogram.

what is the value of r?

2
3
4
5

The value of r is 5

A parallelogram is a quadrilateral with parallel opposite sides but the angle between adjacent side is not 90°. Two opposite angles  are equal and acute in nature and the other  two opposite angles are equal and obtuse in nature.  

Given CDEF is a parallelogram

We have to find out the value of r

According to the property of parallelogram

The opposite sides of parallelogram are equal and hence we can right

From equations (1) ,(2) and (4) we can say that

The value of r is 5

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so the possibilities of the measurement of the side of the triangle are either it is longest side or not the longest side

when it is the longest side

s < 25 + 35s < 60

if it is not the longest side

35 < 25 + s10 < sso 10 < s < 60so the perimeter70 < p < 130

the answer is:

the correct option is the option b.

to calculate the surface area of the right cylinder, we need to use the following formula:

from the picture we know that:

so, substituting and calculting we have:

hence, we have that the correct option is the option b.

have a nice day!