Question

Easy question, Will mark brainlist

Answer 1

Answer:

answer of 13) Lenght of one edge of this cube = 3cm

answer of 14) The area of BCE = 25 cm^2

Step-by-step explanation:

Any cube has six identical sides.

Let one side have an area of A.

Let the lenght of one cubic side be L.

L * L = A

So this results in L = SQRT (A)

All six A combined add up to 54 cm^2.

Then 6 * A = 54

A = 54/6 = 9 cm^2

L = SQRT (9)

Lenght of one edge of this cube = 3cm

To find the area of BCE you can simply subtract the area of CDE from the biggest triangle BDE.

2 * BDE = {5+4) * 10

so BDE = 45

2 * CDE = 4 * 10

so CDE = 20

BCE = BDE - CDE

BCE = 45 - 20

The area of BCE = 25 cm^2