Given: ∆abc –iso. ∆, m∠bac = 120°
ah ⊥ bc , hd⊥ ac
ad = a cm, hd = b cm
find: p∆adh

solve without using pythagorean theorem

Step-by-step explanation:

See the attached diagram.

Given that, Δ ADH is a right triangle with ∠ ADH = 90°.

So, applying Pythagoras Theorem  

AH² = AD² + DH² = a² + b²

⇒   {Neglecting the negative root as AH can not be negative}

Therefore, the perimeter of the triangle Δ ADH = AD + AH + DH  

⇒ (Answer)

ion

step-by-step explanation:

ion ion ion ion ion ion ion ion ion ion ion

the height of the surface increases from the center out to the sides of the road.

step-by-step explanation:

as we move out we move away from the x-axis.

and as mentioned in the problem statement that height of a road increases when we move away from the center x.

hence proved that 3rd option

the height of the surface increases from the center out to the sides of the road.

is the correct option.