Question

Answer pls attachment below

Answer 1

Answer:

210

Step-by-step explanation:

perimeter of the triangle = 70cm

{(4x+1)+(3x-1)+(3x) }cm = 70cm

10x cm = 70cm

x cm = 70cm/10 = 7cm

so, 3x = 3(7)cm = 21cm

3x-1 = 21cm - 1cm = 20

area of the triangle = A cm^2

(b*h/2)cm^2 =  A cm^2

(21 * 20/2)cm^2 = A cm^2

210 cm^2 = A cm^2

A = 210

PLS MARK ME AS BRAINLIEST

Answer 2

Step-by-step explanation:

Sides of the triangle = (3x-1), (4x-1), 3x.

Perimeter = sum of all the sides = 70 cm.

So, (3x-1)+(4x+1) +(3x) = 70 cm,

Then 10x = 70,

implies that, x = 7 cm,

Now,

Sides of the triangle = (3x-1)= [ 3(7)-1 ] = 20 cm.

(4x+1) = [4(7)+1)] = 29 cm.

3x = 3(7) = 21 cm.

Now, this is a right angled triangle, then altitude and base sides of this triangle are 21 cm and 20 cm.

Then, area of this triangle = 1× base× height/2,

= 20× 21/2

= 10× 21 cm²,

= 210 cm².