2. matthew schembri class 4;2 1 MATHS A R E A A N D / O R S U R F A C E A R E A

3. matthew schembriclass 4;22 THE AREA OF A CIRCLE RADIUS IF THE RADIUS OF A CIRCLE IS 3CM, TO FIND THE AREA WE NEED TO USE THIS FORMULA : A=  * 3 TO THE POWER OF 2 ANS= 28.27 CM

4. matthew schembriclass 4;23 TO FIND THE CURVED SURFACE AREA OF A CYLINDER TO FIND THE CURVED SURFACE AREA OF THIS CYLINDER WE NEED TO USE THIS FORMULA: H 2 *  * RADIUS

5. matthew schembriclass 4;24 CURVED SURFACE AREA OF A CONE THIS DIAGRAM IS A CONE. IF WE NEED TO FIND IT’S CURVED SURFACE AREA WE NEED TO USE THIS PARTICULAR FORMULA: CURVED SURFACE AREA =  * RADIUS * SLANT HEIGHT H L

6. matthew schembriclass 4;25 THE AREA OF A TRIANGLE H AREA= 1/2 * BASE * HEIGHT USED WHEN GIVEN A SIDE AND IT’S PERPENDICULAR HEIGHT. AREA=1/2 AB SIN C USED WHEN GIVEN TWO SIDES AND THE INCLUDED ANGLE. AREA= S (S-A) (S-B) (S-C) USED WHEN GIVEN THE 3 SIDES. C ab AB

7. matthew schembriclass 4;26 AREA OF SECTOR TO FIND THE AREA OF A SECTOR IN A CIRCLE WE NEED TO USE THIS PARTICILAR FORMULA: AREA OF SECTOR= O *  * RADIUS TO THE POWER OF 2 360

8. matthew schembriclass 4;27 TO FIND THE SURFACE AREA OF A TRAPEZIUM THE TRAPEZIUM HAS TWO PARALLEL SIDES ONLY. TO FIND THE AREA OF A TRAPEZIUM WE NEED TO USE THIS FORMULA: 1 (A+B) * HEIGHT = 1 (SUM OF PARALLEL LINES * HEIGHT) 2 A B H

9. matthew schembriclass 4;28 ALL TRIANGLES HAVING SAME BASE AND SAME HEIGHT HAVE EQUAL AREAS A = 1 (B * H) 2

10. matthew schembriclass 4;29 ALL PARALLELOGRAMS HAVING SAME BASE AND SAME HEIGHT HAVE EQUAL AREAS A = (B * H)

11. matthew schembriclass 4;210