Question

answer this questions




answer correct answer​

Answer 1

Answer:

got assist for the q 17

let x be the b and x+4 be the l

then

2 (l+b)= 84

2×(x+4+x)=84

2×(2x+4)=84

4x+8= 84

x =72/4=18 heres it dude

Answer 2

Step-by-step explanation:

Solutions :-

17)

Let the breadth of a rectangle be X cm

Length of the rectangle = Breadth +4 cm

=> l =( X+4 ) cm

we know that

Perimeter of a rectangle = 2(l+b) units

Perimeter of the given rectangle

=> 2(X+4+X) cm

=> 2(2X+4) cm

=> (4X+8) cm

According to the given problem

Perimeter of the rectangle = 84 cm

=> 4X+8 = 84

=> 4X = 84-8

=>4X = 76

=> X = 76/4

=> X = 19

Breadth = 19 cm

Length = 19+4 = 23 cm

Answer :-

Length of the rectangle = 23 cm

Breadth of the rectangle = 19 cm

Check:-

The length =23 cm

The breadth = 19 cm

Length = 23=19+4

Length exceeds the breadth by 4cm

Perimeter = 2(23+19)

=> 2(42)

=> 84 cm

Verified the given relations in the given problem.

18)

Given that

Ratio of the angles of the triangle = 1:4:5

Let they be X° , 4X° and 5X°

We know that

The sum of the three angles in a triangle =180°

=> X°+4X°+5X° = 180°

=> 10X° = 180°

=> X°=180°/10

=> X° = 18°

Now,

4X°=4(18°)=72°

5X°=5(18°)=90°

Answer:-

The three angles of the given triangle are 18°,72°,90°

Check:-

The angles are 18°,72°90°

Their ratio = 18:72:90

(1×18):(4×18):(5×18)

=> 1:4:5

Verified the given relations in the given problem.

Used formulae:-

• Perimeter of a rectangle = 2(l+b) units

• The sum of the three angles in a triangle =180°