1. a photograph measuring 12 cm by 5 cm is mounted on a rectangular cardboard, leaving a margin of 3 cm all around. what area of the cardboard is NOT covered by the photograph
2. the figure at the right is made up of a square with side 3 cm and four congruent isosceles right triangles what is the area of the figure
find the area of the following composite figures
2. the figure at the right is made up of a square with side 3 cm and four congruent isosceles right triangles what is the area of the figure
find the area of the following composite figures
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Length of cardboard = 32.5 + 2*1.5
= 32.5+3=35.5 cm
Breadth of cardboard = 12+2*15
= 12+3 = 15 cm
Area of the cardboard = 35.5*15= 532.5 cm^2
therefore, the area of the cardboard not covered by the photograph = 532.5 — 390=
= 142.5 cm^2
Answer:
Area of the photograph = 32.5 cm * 12 cm = 390 cm^2
Length of cardboard = 32.5 + 2*1.5
= 32.5+3=35.5 cm
Breadth of cardboard = 12+2*15
= 12+3 = 15 cm
Area of the cardboard = 35.5*15= 532.5 cm^2
therefore, the area of the cardboard not covered by the photograph = 532.5 — 390=
= 142.5 cm^2
Step-by-step explanation:
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