Answer:
108 cm²
Step-by-step explanation:
the surface area is the sum of all individual shapes areas on the surface.
2 right-angled triangles
3 rectangles
area of a right-angled triangle is At = a×b/2
At = 4×3/2 = 6 cm²
we need it twice : 12 cm²
one rectangle (length×width) = 8×3 = 24 cm²
one rectangle = 8×4 = 32 in²
one rectangle = 8×5 = 40 cm²
total surface area
A = 12+24+32+40 = 108 cm²
an area is always a square unit (power of 2).
a volume is always a cubic unit (power of 3).
and a length is always a simple unit (power of 1).
Given:
Monday: 6 laps around a 0.25-mile track
Tuesday: 7 laps around a 0.25-mile track
Total miles jogged on both days.
0.25(6 + 7) = 0.25(13) = 3.25 miles
Mike jogged a total of 3.25 miles on Monday and Tuesday combined.
Let the constant stretch factor be x
then
3x + 4x + 2x = 72 Add the left side.
9x = 72 Divide by 9
x = 72/9
x = 8
Therefore the sides are
8*3 = 24
8*4 = 32
8*2 = 16
Total = 72 which checks.