The mathematics lecture discussed formulas for calculating the volume and surface area of cones and trapezoids. The volume of a cone formula is V=πr^2h/3, and an example problem was worked through. The surface area of a cone formula is A=πr(r+√h^2+r^2). The surface area of a trapezoid formula is (a+b)h/2, where a and b are the lengths of the parallel sides and h is the height.

1. MATHEMATICS LECTURE
19TH MARCH 2014

2. VOLUME OF CONE

3. FORMULA OF CONE
V=πr2 h/3

4. EXAMPLE

6. QUESTION 1

7. what is the volume of
this cone? ( π=3.142)

8. QUESTION 2

9. Given a cone with the height
of 10cm and the diameter of
the circle is 18cm. Find the
volume of this cone. Take π as
3.142.

10. SURFACE AREA
OF CONE

11. A=πr(r+√h2+r2)
A=AREA
r=RADIUS
h=HEIGHT

12. SURFACE AREA
OF TRAPEZOID

13. FORMULA OF TRAPEZOID
h
(𝑎+𝑏)
2
= 𝑇𝑆𝐴
H= height
(a+b) = total length of
parallel sides