Question

please could someone help me with this

Answer 1

Step-by-step explanation:

3x + 3x - 1 + 4x + 1 = 70

10x = 70

x = 70/10 = 7

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example :

a = 3x = 3(7) = 21 cm -----> √

b = (3x - 1) = 3(7) - 1 = 21 - 1 = 20 cm ----> ✓

c = (4x + 1) = 4(7) + 1 = 28 + 1 = 29 cm

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The area of Triangle

A = (a × b)/2

A = (21 × 20)/2

A = 21 × 10

A = 210 cm²

Answer 2

Answer:

210

Step-by-step explanation:

the formula for the perimeter of the triangle is a+b+c is 70cm

i.e( 3x-1)+(4x+1)+3x=70

10x=70

x=7cm.

the area of the triangle is bh/2

so,3x-1 is h=3(7)-1=20

3x is b=3(7)=21

area,A=(20*21)/2

=210cm^2