Question

One side of a triangle is 15 inches, and the area of the triangle is 90 sq inches. Find the area of a similar triangle in which the corresponding side is 9 inches.
32.4 sq in
54 sq inch
150 sq inch

Answer 1

I put 32.4 i just don't know how to get there. The first attempt i put 54 and got it wrong

Answer 2

yea..... actually 32.4 is correct...

Answer 3

How did you get to that answer

Answer 4

k watch this.......... what is the formula for area of the first triangle?

Answer 5

On my lesson thing it says that the formula is area/area= s1/s2

Answer 6

k ignore that

Answer 7

now look at this....
\[\frac{ 1 }{ 2 } \times base \times 15 = 90\]

Answer 8

so, by solving, we get base base as 12

Answer 9

now similarly... try finding a corresponding base of other triangle ...
\[\frac{ 9 }{ 15} = \frac{ x }{ 12 }\]

Answer 10

so u get x as 7.2...........

Answer 11

alright I got that

Answer 12

now plug it in the formula for other triangle,.....
\[\frac{ 1 }{ 2 } \times 7.2 \times 9 = 32.4\]

Answer 13

u good @Maccrea ?

Answer 14

Ahh ok I get it now, there are just so many different formulas to remember. Thanks for the help man

Answer 15

sure dude.......... anytime :D

Answer 16

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