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Komok [63]
2 years ago
12

Calculate the area of a circle whose diameter is 7cm.​

Mathematics
1 answer:
Tema [17]2 years ago
4 0

Answer:

49π (or ~154) cm²

Step-by-step explanation:

A = area

A = πr²

r = radius

r = 7

A = π(7)²

= 49π

= 153.938040026 → 154 cm²

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Quadrilateral A has side lengths 6, 9, 9, and 12. Quadrilateral B is a scaled copy of Quadrilateral A, with its shortest side of
Alekssandra [29.7K]

Answer:

Look below

Step-by-step explanation:

Ok, you got a Quadrilateral with the side lengths 6, 9, 9, 12

The shortest of B is 2

Find the scale factor of the A to B

6 -> 2

6/2 = 3

Scale factor is 3

Now divide all the sides by scale factor

6/3, 9/3, 9/3, 12/3 = 2, 3, 3, 4

Add them all together to get the perimeter

2+3+3+4 = 12

Perimeter of B is 12

5 0
3 years ago
a person is standing on top of a smaller building looking across the street at a taller building, which is 260 feet away horizon
Anuta_ua [19.1K]

The height of the smaller building is <u>94.63 feet</u>, computed using the trigonometric ratios.

In the question, we take AB to be the taller building, where A is its top and B is its base, CD to be the shorter building, where C is its top and D is its base, and CE to be the perpendicular from C to AB.

Given that the horizontal distance between the two buildings is 260 feet, we can say that BC = CE = 260 feet.

The angle of elevation from the top of the shorter building to the top of the taller building is 30°, that is, ∠ECA = 30°.

The angle of depression from the top of the shorter building to the base of the taller building is 20°, that is, ∠ECB = 20°.

When ∠ECB = 20°, then ∠CBD = 20°, as they are alternate angles.

We are asked to find the height of the shorter building, that is, we are asked to find CD.

In ΔCBD,

tan ∠CBD = CD/BD {perpendicular/base},

or, tan 20° = CD/260,

or, CD = 260*tan 20° = 260*0.36397023426 {∵ tan 20° = 0.36397023426},

or, CD = 94.6322609092.

Therefore, the height of the smaller building is <u>94.63 feet</u>, computed using the trigonometric ratios.

Learn more about heights and distances at

brainly.com/question/2004882

#SPJ4

7 0
2 years ago
TELL ME IF YOU AGREE IF NOT WHAT SHOULD I CHANGE??! THX
docker41 [41]

Answer:

for my opinion, i think yo should try, i agree.

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Write 9,862,000 in scientific notation.
inn [45]
9,862,000 in scientific notation is 9.862 × 10^6
8 0
3 years ago
Read 2 more answers
Sarah's grape vine grew 15 inches in 6 weeks, write an equation to represent its growth after x weeks
mixer [17]
6x = 15

I apologize if this is wrong!
5 0
2 years ago
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