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3 years ago

Find The surface area of a cone with a radius of 7 and slant hight of 9

Mathematics

1 answer:

liubo4ka [24]3 years ago

4 0

Answer:14

Step-by-step explanation:

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In the given figure ABCD is a tripepizeum with AB||CD. If AO = x-1, CO = BO = x+1 and CD = x+4. Find the value of x.

Hitman42 [59]

$\longmapsto$ The value of "x" is 5.

$\large\underline{\sf{Solution-}}$

Given that,

A trapezium ABCD in which AB || CD such that

AO = x - 1

CO = BO = x + 1

OD = x + 4

Now,

$\rm In \: \triangle \: AOB \: and \: \triangle \: COD$

$\rm \: \angle \: AOB \: and \: \angle \: COD \: \: \{vertically \: opposite \: angles \}$

$\rm \: \angle \:ABO \: and \: \angle \: CDO \: \: \{alternate \: interior \: angles \}$

$\bf \: \triangle \: AOB \: \sim \: \triangle \: COD \: \: \: \{AA \: similarity \}$

$\bf\longmapsto\:\dfrac{AO}{CO} = \dfrac{BO}{DO}$

$\rm \longmapsto\:\dfrac{x - 1}{x + 1} = \dfrac{x + 1}{x + 4}$

$\rm \longmapsto\:(x - 1)(x + 4) = {(x + 1)}^{2}$

$\rm \longmapsto\: {x}^{2} - x + 4x - 4 = {x}^{2} + 1 + 2x$

$\rm \longmapsto\: 3x - 4 = 1 + 2x$

$\rm \longmapsto\: 3x - 2x= 1 +4$

$\bf\longmapsto \:x = 5$

7 0

3 years ago

How do I solve this?

podryga [215]

Answer:

$3078.8in^3$

Step-by-step explanation:

$V=\pi r^2h=\pi *7^2*20=3078.7608\\=3078.8in^3$

4 0

3 years ago

A game has 50 cards with 10 each numbered 1 to 5,and a player must draw a 2 or a 3 to move out of the “start” position.

fenix001 [56]

Answer:

que?

Step-by-step explanation:

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3 years ago

What is 285.39154 rounded to the nearest hundredth

svp [43]

285.39 I belive the awsner is

3 0

3 years ago

Read 2 more answers

A university is trying to determine if certain remedial classes need to be offered to their incoming class. To do so, they give

lora16 [44]

Answer:

The experiment is identifying whether a student gets less than a 75% on the entrance exam.

The trial is one exam being taken.

An outcome is a student scoring 80%.

Step-by-step explanation:

An experiment occurs when an intervention is made by a researcher and its effect are studied, thus the experiment here is identifying whether a student gets less than a 75% on the entrance exam.

The trial is the one exam being taken.

While an outcome is the aftermath of the experiment which includes a student scoring 80%.

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3 years ago