Question

(HELP PLS?)An equilateral triangle has an apothem of 5 cm. Find the area of the triangle to the nearest square centimeter.


B.130 cm
C.188 cm

Answer 1

Ive narrowed it down to B or C. Please help??

Answer 2

@ganeshie8 Could you help me with this? o:

Answer 3

I keep getting the wrong answer for this.. i dont know how to get B or C as my answer. :S

Answer 4

if your distance from center mass to middle of side is 5 and its an equilateral triangle...

could you use a = r cos (180/n) to find the radius then
h^2 = a^2 + b^2
to find half the base length then double it to find the full base length then times that by double the apothem to find your vertical height and multiply out to find your area...?

Answer 5

130?

Answer 6

hang on, calculating

Answer 7

ok.

Answer 8

Was i right? or wrong?

Answer 9

a = r cos (180/n)
a = apothem
r = radius (to the corners
n = number of sides

so r = 10

Answer 10

so i was wrong??

Answer 11

so side length = 17.3
verticle height = 15
so area = 129.9

Answer 12

u were right

Answer 13

ty!!

Answer 14

yw