Find the lateral area of a cone with a radius of 7 ft. and a slant height of 13 ft.
Use 3.14 for π and round to the nearest whole number.
439 ft2
324 ft2
572 ft2
286 ft2***
Find the volume of a square pyramid with a base length of 9 cm and a height of 4 cm.
324 cm3
108 cm3
36 cm3***
152 cm3
1. D, 285.7 ft^2
2. B, 1536 cm^2
3. C, 803.8 in.^2
4. A, 1607.7 in.^3
5. B, 105 mm^3
6. A, 147 yd^3
7. B, 108 cm^3
8. C, 415 in^3
9. A, 628 mm^3
correct
Unit 2 lesson 9 what r the answers?
cone: ok
pyramid: v = 1/3 Bh = 1/3 * 81 * 4 = 108
B is the area of the base, not the side length
Thxs Steve :)
@Barry Allen aka the flash
Was right I got 100%
To find the lateral area of a cone, you can use the formula: lateral area = π * radius * slant height.
In this case, the radius of the cone is given as 7 ft and the slant height is given as 13 ft.
Plugging the values into the formula, we get:
lateral area = 3.14 * 7 ft * 13 ft
= 3.14 * 91 ft
= 285.74 ft²
Rounding this to the nearest whole number, we get 286 ft².
Therefore, the correct answer is 286 ft².
Now, let's move to the second question about finding the volume of a square pyramid.
To find the volume of a pyramid, you can use the formula: volume = (base area * height) / 3.
In this case, the base length of the square pyramid is given as 9 cm and the height is given as 4 cm.
First, we need to find the base area of the square pyramid. The base area of a square is calculated by multiplying the length of one side by itself. So, the base area is 9 cm * 9 cm = 81 cm².
Plugging the values into the formula, we get:
volume = (81 cm² * 4 cm) / 3
= 324 cm³ / 3
= 108 cm³
Therefore, the correct answer is 108 cm³.
Hence, the option with 36 cm³ is incorrect.