Question

In a triangle ABC AB=3cm, BC=4cm.Find AC?​

Answer 1

Step-by-step explanation:

Answer

Given that

AB=3cm

BC=4cm

And,AC=5cm

step of construction

(i) Draw a line segment BC=4cm

(ii) With C as centre and radius 5cm draw an arc.

(iii) With B as centre and radius AB=4cm draw an arc cutting the previous arc at A

(iv) join AC and AB then ΔABC is the required right angle triangle

Answer 2

Answer:

If the angle B = 90°, AC is the hypotenuse and is equal to 5 cm by Pythagoras theorem.

Area of ∆ ABC = (1/2)(AB)(BC)

= (1/2)(3)(4) = 6 cm^2 …….(1)

If the hypotenuse is taken as the base and BD as the height then the area of the ∆ABC

= (1/2)(AC)(BD)

=> (1/2)(5)(BD) = 6 from (1)

=> BD = 12/5 = 2.4 cm.

Step-by-step explanation:

Kashuuu~