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you mean area of the base?

wait, no. base area is .5xh(b1+b2) so i need the height

i though height was given as 3 cm?

thats the height of the pyramid

okay, and what do you need to evaluate?

the height of the base

x=18cm3

ah, so you should say its a trapezoidal pyramid.

yes

okay, do you know the formula to the volume of a pyramid?

yes. 1/3 x B x H

what is B in the formula?

i dont know. b1 = 2 cm b2= 3 cm

yess.

volume of a pyramid is one-thirds the product of the base area and its height

yea

so B is the area of the base.
right,
so substitute H and V in the equation

right

soooo,,,,,,,,,,,,,,,,,,,,

so, tell me what you got after substituting the values of V and H.

V= 18cm H= 3cm. h= i dont know

substitute V = 18, H =3 in
V = 1/3 x B x H and find the value of B.

but H is the height of the pyramid, i need the height of the base (h)

so how do you find h?

BUT I DONT KNOW THE BASE. sorry i'm not good at math, my lord.

where did we get 36

multiply 18 by 2 and divide by 5.

i got h = 7.2. is this correct?

yeah. oooo you used a calculator to find the value of 36/5! good on you!

btw, which grade are you in?

7th

okay. Have you ever done manipulation of equations?

no

like if x = y+2, what is y?

x-2?

then why do you say you haven't done any algebraic manipulation before?

btw, h= 2.4. 1/2 x 2.4 (3+2) = 6. 6x3=18.

why do you say 6 x 3 = 18?

is the formula for volume of a pyramid area of base x height?

oh yeah, divide by 3. nevermind...

good, at least you figured that out on your own.

oh stopp

:D