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QUESTION: 1

The monitors of computers are measured along the diagonal. What is the size of the largest monitor that can be placed in a space measuring 17″ x 21″?

Solution:

Since monitors are measured along the diagonals this means we need to use pythagoras theorem for this right angled triangle.

H^{2 }= P^{2 }+ B^{2}

=17 * 17 + 21 * 21

=289 + 441 = 730

H=27’’ (Approx)

QUESTION: 2

If the legs of an isosceles right triangle are 5 cm long, approximate the length of the hypotenuse to the nearest whole number.

Solution:

QUESTION: 3

Find the height of the given triangle if its base is 26 inches and the slant side is 15 inches long as shown below.

Solution:

Height of the triangle is the altitude. SInce the triangle is an isosceles triangle its median is equal to its altitude . So this means that the altitude is perpendicular and bisects the opposite side .

So BD=DC=26/2=13

So in right angled Triangle,

Using Pythagoras theorem,

H^{2 }= P^{2 }+ B^{2}

225 = P^{2 }+ 169

QUESTION: 4

If the sum of the squares of a and b is the same as the square of c and if m < n, then for what value of k can the Pythagorean triples be generated with the following equations?

a = n^{2} + k , b = 2mn : c = m^{2} + n^{2}

Solution:

QUESTION: 5

Find the total perimeter of the given figure.

Solution:

QUESTION: 6

What is the diagonal length of a TV screen whose dimensions are 80 cm x 60 cm?

Solution:

QUESTION: 7

If the sum of the length of the legs of a right triangle is 49 cm and the hypotenuse is 41 cm, find its shortest side.

Solution:

Sum of the length of the legs of a right angle triangle is 49

So let one leg be x, other will be 49-x

Applying Pythagoras theorem,

H^{2}=P^{2}+B^{2}

41*41=x^{2}+(49-x)^{2}

1681=x^{2 }+ 2401 + x^{2 }- 98x

2x^{2}- 98x + 720 = 0

Dividing the equation by 2

x^{2 }- 49x + 360 = 0

x^{2 }- 9x - 40x + 360 = 0

x (x - 9) - 40 (x - 9) = 0

(x - 9)(x - 40) = 0

So x is either 9 or 40,

So the smaller side is 9 cm

QUESTION: 8

How far up a wall will an 11m ladder reach, if the foot of the ladder is 4m away from the wall?

Solution:

The height of wall will be the perpendicular for the right angle triangle. So applying pythagoras theorem

H^{2}=P^{2}+B^{2}

11*11=P^{2}+16

P=121-16=10.2 cm

QUESTION: 9

A wood frame for pouring concrete has an interior perimeter of 14 metres. Its length is one metre greater than its width. The frame is to be braced with twelve-gauge steel cross-wires. Assuming an extra half-metre of wire is used at either end of a cross-wire for anchoring, what length of wire should be cut for each brace?

Solution:

Let width is x

Then length is x+1

Perimeter =x +x + x + 1 + x + 1 = 14

4 x= 12

x = 3

length = 4

Using Pythagoras theorem,

H^{2} = P^{2 }+ B^{2}

=9 + 16 = 25

H = 5cm

An extra half meter on either side will give the length of the wire as 5 + 1 = 6cm

QUESTION: 10

Anuj swims across a pool diagonally every day. The pool is 4 m wide, and it is 16 m diagonally across. What is the length of the pool?

Solution:

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