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3 years ago

Help please! Work do be a struggle tho

Mathematics

1 answer:

beks73 [17]3 years ago

8 0

Answer:

$h = \dfrac{S}{2 \pi r} - r$

Step-by-step explanation:

$S = 2 \pi rh + 2 \pi r^2$

$2 \pi rh + 2 \pi r^2 = S$

$2 \pi rh = S - 2 \pi r^2$

$h = \dfrac{S}{2 \pi r} - \dfrac{2 \pi r^2}{2 \pi r}$

$h = \dfrac{S}{2 \pi r} - r$

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The difference between 4 twenty fives and three twenty fives

-Dominant- [34]

Answer:

4 twenty fives is 100 and 3 twenty fives is 75

Step-by-step explanation:

Hope this help:)

7 0

3 years ago

Here is a triangular pyramid and its net.

bazaltina [42]

Answer:

a) Area of the base of the pyramid = $15.6\ mm^{2}$

b) Area of one lateral face = $24\ mm^{2}$

c) Lateral Surface Area = $72\ mm^{2}$

d) Total Surface Area = $87.6\ mm^{2}$

Step-by-step explanation:

We are given the following dimensions of the triangular pyramid:

Side of triangular base = 6mm

Height of triangular base = 5.2mm

Base of lateral face (triangular) = 6mm

Height of lateral face (triangular) = 8mm

a) To find Area of base of pyramid:

We know that it is a triangular pyramid and the base is a equilateral triangle. $\text{Area of triangle = } \dfrac{1}{2} \times \text{Base} \times \text{Height} ..... (1)\\$

${\Rightarrow \text{Area of pyramid's base = }\dfrac{1}{2} \times 6 \times 5.2\\\Rightarrow 15.6\ mm^{2}$

b) To find area of one lateral surface:

Base = 6mm

Height = 8mm

Using equation (1) to find the area:

$\Rightarrow \dfrac{1}{2} \times 8 \times 6\\\Rightarrow 24\ mm^{2}$

c) To find the lateral surface area:

We know that there are 3 lateral surfaces with equal height and equal base.

Hence, their areas will also be same. So,

$\text{Lateral Surface Area = }3 \times \text{ Area of one lateral surface}\\\Rightarrow 3 \times 24 = 72 mm^{2}$

d) To find total surface area:

Total Surface area of the given triangular pyramid will be equal to <em>Lateral Surface Area + Area of base</em>

$\Rightarrow 72 + 15.6 \\\Rightarrow 87.6\ mm^{2}$

Hence,

a) Area of the base of the pyramid = $15.6\ mm^{2}$

b) Area of one lateral face = $24\ mm^{2}$

c) Lateral Surface Area = $72\ mm^{2}$

d) Total Surface Area = $87.6\ mm^{2}$

3 0

3 years ago

Help me please. solve for f (-2)

Naddika [18.5K]

Answer:

Step-by-step explanation:

5 0

2 years ago

Read 2 more answers

A pet store has 5 cats. They need to split 7 cups of cat food evenly between each cat. How many cups of cat food will each cat g

kumpel [21]

Answer

1.4 cups

when you divide 7/5 you get 1.4 cups

1.4 lies between 1 and 2

so:

1-------1.4------2

3 0

3 years ago

What is the surface area in square inches of the prism

Lerok [7]

Answer: the answer is 25

Step-by-step explanation:

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2 years ago