If the sides of triangular base of prism are 13 cm,20 and 21cm respectively. find the area of cross section. ​

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step-by-step explanation:

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.

ratio is 2 : 9

the answer is three

13.5 : 3

the correct answer would be:

220 centimeters

to get this you can use the pythagorean theorem

hope this

step-by-step explanation: