1. A. The perimeter refers to the sum of the length of all the sides of a closed plane figure.
2. D. 70m
3. A 50cm
4. C. 45cm
5. D 56m
Part 2
1. A. It is still the perimeter, but the sentence is constructed differently.
2. C. 32cm
3. C. 72cm
4. B. 20m
Step-by-step explanation:
A.
2. Perimeter for rectangle: 2l + 2w
2(20) + 2(15) = 40 + 30 = 70
3. Perimeter for triangle: Just add the sides.
16 + 12 + 22 = 50
4. Perimeter for square: 4s
4s = 180
s = 45
5. Perimeter for Pentagon(if not regular): Just add the sides.
10 + 10 + 14 + 14 + 8 = 56
B.
2. Finding the side of a triangle: Subtract the perimeter by the other 2 sides.
76 - 24 - 20 = 32
3. Perimeter for square: 4s
4s = perimeter
4(18) = perimeter
72 = perimeter
4. Perimeter for trapezoid: It actually ain't a trapezoid, because the length of the legs aren't the same, so it is just a quadrilateral. Use the same formula as number 2, but subtract its 3 sides, since there are 4 sides.
Answers & Comments
Answer:
Part 1
1. A. The perimeter refers to the sum of the length of all the sides of a closed plane figure.
2. D. 70m
3. A 50cm
4. C. 45cm
5. D 56m
Part 2
1. A. It is still the perimeter, but the sentence is constructed differently.
2. C. 32cm
3. C. 72cm
4. B. 20m
Step-by-step explanation:
A.
2. Perimeter for rectangle: 2l + 2w
2(20) + 2(15) = 40 + 30 = 70
3. Perimeter for triangle: Just add the sides.
16 + 12 + 22 = 50
4. Perimeter for square: 4s
4s = 180
s = 45
5. Perimeter for Pentagon(if not regular): Just add the sides.
10 + 10 + 14 + 14 + 8 = 56
B.
2. Finding the side of a triangle: Subtract the perimeter by the other 2 sides.
76 - 24 - 20 = 32
3. Perimeter for square: 4s
4s = perimeter
4(18) = perimeter
72 = perimeter
4. Perimeter for trapezoid: It actually ain't a trapezoid, because the length of the legs aren't the same, so it is just a quadrilateral. Use the same formula as number 2, but subtract its 3 sides, since there are 4 sides.
104 - 23 - 23 - 38 = 20