Answer:
1. 1,350 dm²
2. 94 cm²
3. 250π m² or 785.40 m²
Step-by-step explanation:
The surface area formula for Cube is A= 6a²
The given is 15dm substitute it to the variable a
A=6(15dm)²
A=6(225 dm²)
A=1,350 dm²
Formula for the surface area of Rectangle
S= 2(wh+lw+lh)
Given:
L=3 cm
W=4cm
H=5cm
Substitute;
S= 2{ (4)(5)+(3)(4)+(3)(5)}
S= 2(20+12+15)
S= 2(47)
S= 94cm²
Formula for the surface area of a Cylinder
A= 2πr²+h(2πr)
Substitute the given r(radius)= 5m and h=20m
A= 2π(5)²+20{(2π)(5)}
A=2π(25)+20(10π)
A=50π+200π
A=250π m² or 785.40m²
Simplify; π is equivalent to 3.14
250(3.14)= 785 m²
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Answer:
1. 1,350 dm²
2. 94 cm²
3. 250π m² or 785.40 m²
Step-by-step explanation:
The surface area formula for Cube is A= 6a²
The given is 15dm substitute it to the variable a
A=6(15dm)²
A=6(225 dm²)
A=1,350 dm²
Formula for the surface area of Rectangle
S= 2(wh+lw+lh)
Given:
L=3 cm
W=4cm
H=5cm
Substitute;
S= 2{ (4)(5)+(3)(4)+(3)(5)}
S= 2(20+12+15)
S= 2(47)
S= 94cm²
Formula for the surface area of a Cylinder
A= 2πr²+h(2πr)
Substitute the given r(radius)= 5m and h=20m
A= 2π(5)²+20{(2π)(5)}
A=2π(25)+20(10π)
A=50π+200π
A=250π m² or 785.40m²
Simplify; π is equivalent to 3.14
250(3.14)= 785 m²