Notes- Harder Work

Question	Answer
Solving Problems Using an Area Scale Factor	ASF=LSF² LSF=√ASF ▲ A has a base length 6cm, ▲ B has a base length 21cm. The area of ▲ A is 30cm². What is the area of ▲ B? LSF= 21/6=3.5 ASF= 3.5² B=30 x 3.5² = 367.5cm²
Solving Problems Using an Volume Scale Factor	VSF= LSF³ LSF=³√VSF Shape A's diameter is 3cm and contains 0.2L of paint. Shape B's diameter is 21cm. What is the volume of B? LSF= 21/3= 7 VSF= 7³ B= 0.2 x 7³ = 68.6L
Sum of Interior Angles in a Polygon	(Number of sides - 2) x 180
Size of Polygon Exterior Angles (Sum of EA is 360°)	360° / Number of Sides
Size of Polygon Interior Angle	(180- 360/ Number of Sides) x 360
Finding the Prime Factors of a Number (Cheat)	Find the prime factors by typing number into calculator then equals then shift Fact.
Finding the LCM	The highest power of each PF multiplied together: Example, find the LCM of 84 and 150. Find the PF of each number. 84= 2²x 3¹ x 5° x 7¹ 150=2¹ x 3¹ x 5² x 7° LCM=2²x 3¹ x 5² x 7¹ LCM=4 x 3 x 25 x 7 LCM=2100
Finding the Highest Common Factor	The lowest power of each PF multiplied together: Example, find the HCF of 84 and 150. Find the PF of each number. 84= 2²x 3¹ x 5° x 7¹ 150=2¹ x 3¹ x 5² x 7° HCF=2¹x 3¹ x 5° x 7° HCF=2x3x1x1 HCF=6

Resource summary

	Created by Becca Washer about 10 years ago