Question

Compute the area of the following triangle. (Express answer in cm²)

b = 20 in.

h = 4 in.

a = ____ cm2

Answer 1

@mayankdevnani

Answer 2

so ssimple

Answer 3

area of triangle=1/2*base*height

Answer 4

1/2*20*4=40cm^2=area

Answer 5

@Claire4christ ok

Answer 6

ok so its 1/2x20x4

Answer 7

yaa

Answer 8

area=40cm^2

Answer 9

1,600

Answer 10

what?

Answer 11

so its ss40x40 basically

Answer 12

The initial units are in inches and the answer needs to be converted to cm. Or convert the initial units to cm before using 1/2 x b x h

Answer 13

how you do that i don'n remember

Answer 14

Lets convert to cm first.

Do you know how many cm in an inch?

One of us can look it up.

Answer 15

50.8=20in

Answer 16

1 inch = 2.54 cm

Answer 17

20 inch = 20 x 2.54 cm

Answer 18

b=50.8

Answer 19

OK so just use the 1/2 x b x h with each measure converted to cm and "ta da."

Answer 20

518.16

Answer 21

259.08

Answer 22

cm2

Answer 23

259.08x259.08

Answer 24

right

Answer 25

Wait, wait. The units are squared. you don't square you answer. I'll try to explain in a second.

Answer 26

so its gonna be 259.08

Answer 27

259

Answer 28

ok

Answer 29

Smae for a triangle or any shape. You use a formula or equation to figure out the area and the units of an area are squares, literally, a 4 sided square, 1 unit by 1 unit, 1 square unit.

Answer 30

Do you understand? This is pretty important to know.

Answer 31

ok so we convert them

Answer 32

and i got 259.08

Answer 33

259.08 what?

Answer 34

inches, centimeters, square inches or square centimeters?

Answer 35

cm2

Answer 36

What I want to make sure you understand is what the area is and the units of area measurement, what they are and how you get them. If you got it, great.

Answer 37

yes i got that

Answer 38

is my answer right or not

Answer 39

squaring your answer after calculating the area is what concerned me.

Answer 40

Yes.

Answer 41

you told me not do it.

Answer 42

its says not right

Answer 43

20x2.5=50
4x2.5=10

Answer 44

b = 20 in = 20 x 2.54 cm = 50.8 cm
h = 4 in = 4 x 2.54 cm = 10.16 cm
Area = 1/2 x 50.8 cm x 10.16 cm
Area = 1/2 (516.128) cm^2 = 258.064 cm^2
Which is completely precise.
Do they tell you to round?

Answer 45

i got 250

Answer 46

If they are using 2.5 cm per inch, that would make it less precise. But if that is what they used then that is what you should use. Is 250 cm^2 correct?

Answer 47

not right weird

Answer 48

I am clueless. Sorry. You are doing it right. 250 is what I get if 1 in = 2.5 cm.

Answer 49

ill ask my teacher about that question tomorrow

Answer 50

If rounding to one decimal place were to happen after calculating using 1 in = 2.54 cm then the answer would be 258.1 cm^2 not 259.08. 259.08 is a little bit off, maybe that's it.

Answer 51

still not right that's ok ill ask my teacher tommorow.