Help me in my math end test there are the things i need to learn. Please​

for the trapezoid/trapezium

the formula for finding the area of a trapezoid is A=(a+b)/2*h, and if you didnt know, a and b are always parallel.

for the parallelogram

it will always be b*h, this one is pretty easy to remember, also parallelograms include squares, rectangles, and anything with 4 sides.

the example

lets just say that we are missing a, which is the top one. now we have to fill in the missing little bit marked by a green square. this particular trapezoid is symmetrical, so we dont have to find the other side, but if it wasn´t, then you have to find the other side with the Pythagorean thoream. That is what we are going to do now. We have a and c and we need to find b in a²+b²=c², so plug in our values for a and c

(10)²+b²=(13)²

100+b²=169

now just isolate b and solve

b²=69

how to undo a square is by taking the square root of the other side of the equation

sqrt(69) is about 8.3

sorry this took me forever

jml angle lkj & angle mj = lm

sas (side angle side)

aa (angle angle)

sss(side side side)

sas find two sides with an angle in between

aa is finding two angles and the third will add up to 180

sss find all sides

step-by-step explanation: