Question

help me in 3rd n 4th ​

Answer 1

Answer:

fourth answer is area = 12

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Answer 2

Answer:

13. Area= 216 cm²

14. Area= 864 cm²

Step-by-step explanation:

13. As we know that if the sum of the square of two sides of a triangle is equal to the square of the third side then the triangle is a right angled triangle.

here, (18)²+(24)²=(30)²

So, the given triangle is right angled triangle and 30 cm is its hypotenuse

As we know

Area of right angled triangle= (Base×height)/2

=(24×18)/2

=216 cm²

14. let the sides of the triangle be 3x,4xand 5x respectively.

Then Perimeter of triangle =3x+4x+5x

144=12x

x=12.

So the sides of the triangle are 3×12,4×12,5×12

That is 36,48,60 cm respectively.

Here again,

(36)²+(48)²=(60)²

So, our triangle is right angled triangle

So, Area of right angled triangle= (Base×height)/2

=(36×48))/2

=864 cm²