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devlian [24]
4 years ago
14

2. What is the value of x? Show your work.

Mathematics
2 answers:
kirza4 [7]4 years ago
8 0

Answer:

x=7

Step-by-step explanation:

We are given that

\angle K=\angle N

\angle J=\angle M

Therefore, \triangle JKL\sim \triangle MNP

By AA similarity postulate

AA similarity: When two angles of one triangle are equal to its corresponding angles of other triangle then , two triangles are similar by AA similarity.

When two triangles are similar then the ratio of their corresponding sides are equal.

Therefore, \frac{JK}{MN}=\frac{JL}{MP}

We have JK=25 units,MN=30 units

JL=20 units,MP=4x-4

Substitute the values then we get

\frac{25}{30}=\frac{20}{4x-4}

\frac{5}{6}=\frac{20}{4(x-1)}=\frac{5}{x-1}

x-1=\frac{5\times 6}{5}

x-1=6

x=6+1=7

Hence, the value of x=7

trapecia [35]4 years ago
4 0
The answer will be 7.....value of x is 7 i believe

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Step-by-step explanation:

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3^{n} =\frac{1}{81}\\\\         = \frac{1}{3^{4}}\\\\3^{n} = 3^{-4}

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Find the Total surface area of a cone if it's slant height is 21m and diameter of it's base is 24m.
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<h3><u>Answer :- </u></h3>

  • The total surfAce area of cone is <u>1244.57m².</u>

<h3><u>Step-by-step</u><u> </u><u>explanation</u><u> </u><u>:</u><u>-</u><u> </u></h3>

<u>To </u><u>find </u><u>:</u><u>-</u><u> </u>

  • The total surface area of cone..

<h3><u>Solution :- </u></h3>

Given that ,

  • The slant height of the cone = 21m.
  • Diameter of it's base = 24m.

<h3><u>♦</u><u> </u><u>Radius is </u></h3>

<u>=</u>> Diameter / 2

=> 24 / 2

=> 12m

<h3>As we know that , </h3>

<u>Total surface area of cone = πr ( r + L ) .</u>

<h3><u>Where</u><u> </u><u>we </u><u>know</u><u>,</u></h3>

  • π = 22/7
  • r = Radius ( radii )..
  • L = Slant height.

<h3>According to the question :- </h3>

The total surface of cone is,

<u>=> Total surface area = πr { r + L } ..</u>

=  \frac{22}{7}  \times 12 \times (12 + 21)

=  \frac{22}{7}  \times 12 \times 33

= (22 \times 12 \times 33) \div 7

= (726 \times 12) \div 7

= 8712 \div 7

= 1244.57 {m}^{2}

• Therefore , The total surface area of cone is <u>1244.57m².</u>

Hope this helps you :)

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