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slava [35]
3 years ago
6

The length of a rectangle is 13 ft. And its width is 49 ft. What is its perimeter? 512 ft 427 ft 79 ft 159 ft

Mathematics
2 answers:
Evgen [1.6K]3 years ago
8 0

Answer:

its 124?

Step-by-step explanation:

crimeas [40]3 years ago
7 0

Answer:

  = 124 ft

Step-by-step explanation:

Perimeter of a rectangle is

P = 2(l+w)

We know the length is 13 and the width is 49

P = 2(13+49)

   =2(62)

   = 124 ft

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Liono4ka [1.6K]

Answer:

Q7. 11.3 inches (3 s.f.)

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Step-by-step explanation:

Q7. Please see attached picture for full solution.

Q8. Let the length of a side of the square be x ft.

Applying Pythagoras' Theorem,

34^{2}  =  {x}^{2}  +  {x}^{2}  \\ 2 {x}^{2}  = 1156 \\  {x}^{2}  = 1156 \div 2 \\  {x}^{2}  = 578 \\ x =  \sqrt{578}  \\

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Q9. Equilateral triangles have 3 equal sides and each interior angle is 60°.

Since the perimeter of the equilateral triangle is 126cm,

length of each side= 126÷3 = 42 cm

The green line drawn in picture 3 is the altitude of the triangle.

Let the altitude of the triangle be x cm.

sin 60°= \frac{x}{42}

\frac{ \sqrt{3} }{2}  =  \frac{x}{42}  \\ x =  \frac{ \sqrt{3} }{2}  \times 42 \\ x = 21 \sqrt{3}  \\ x = 36.4

(to 3 s.f.)

Therefore, the length of the altitude of the triangle is 36.4cm.

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3 years ago
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