Nameless:
Calculate the area of the regular pentagon below: A regular pentagon with side length of 22.3 inches and dotted line from center to middle of side of 15.4 inches. 686.84 square inches 732.34 square inches 858.55 square inches 1717.1 square inches
Nameless:
Pic
hhanan:
the link doesn't work
Nameless:
oh ok
Nameless:
thats the one
jimthompson5910:
The regular pentagon breaks up into 5 identical triangles (all of the triangles have the same area). Calculate the area of one triangle, then multiply by 5 to get the area of the pentagon. Area of triangle = 0.5*base*height |dw:1610560206596:dw|
jimthompson5910:
|dw:1610560295038:dw|
Nameless:
thats correct
Nameless:
what da answer
jimthompson5910:
If the base is 22.3 and height is 15.4, whats the area of the triangle? |dw:1610560497272:dw|
Nameless:
|dw:1610560557344:dw|
Nameless:
|dw:1610560640998:dw|
Nameless:
7.7 times 5 equals 38.5
jimthompson5910:
not sure how you're getting those numbers
jimthompson5910:
you should use 22.3 and 15.4
Nameless:
oh ok
Nameless:
Its 858.55
jimthompson5910:
The area of one triangle is 0.5*b*h 0.5*22.3*15.4 171.71 So the area of five of the triangles is 5*171.71 = 858.55 which is the area of the pentagon. You have the correct answer
Nameless:
i do
Nameless:
ty
jimthompson5910:
no problem
Nameless:
i become fan of u
Nameless:
u helpful
jimthompson5910:
I'm glad I helped out
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