Find the wrong number in the given number series.

The radius of the incircle of a triangle is 10 cm. if the area of the triangle is 60 cm ² , then its perimeter is?

In ΔABC, PQ is parallel to BC If AP: PB= 3:2 and AQ= 6 cm, AC is equal to?

In ∆ABC, AD = DB , DE is parallel to BC, and the area of ∆ABC is 20 cm². What is the area of ∆ADE in cm² ?

The length of the each side of an equilateral triangle is 7√3. The area of incircle, (cm ² ) is

If O is circumcentre of acute angled triangle ABC, if ∠  BAC = 40 ˚  then  ∠ BOC = ?

In a ∆ ABC, the angle bisector of ∠A, ∠B, ∠C meet at point I, if ∠AIC is double of equilateral ∆ , then find the ∠ABC =? (in degree)

The lengths of three medians in a triangles are 30 cm, 40 cm, 50 cm. What is the area of that traingle (in cm ² )?