# Area of the shape - 9th grade (14y) - math problems

#### Number of problems found: 470

• The cylinder 2 Find the volume and the lateral area of a cylinder of height 12 inches and a base radius of 4 inches.
• Hexagon Calculate the regular hexagonal prism's surface whose base edge a = 12cm and side edge b = 3 dm.
• Seat How much m² of fabric do we need to sew a 50cm-shaped cube-shaped seat if 10% of the material we add to the folds?
• Content area and percents Determine what percentage is smaller cube surface, when the surface area of the wall decreases by 25%.
• Reservoir 6 m long reservoir has a diameter of 2.2 m. What is its surface area in square meters?
• The resistance What is the resistance of an aluminum wire 0.2 km long and 10 mm in diameter?
• Roller Roller has a diameter of 0.96 m and a width 169 cm. How many m2 of road level when he turns 42-times?
• Pyramid cut We cut the regular square pyramid with a parallel plane to the two parts (see figure). The volume of the smaller pyramid is 20% of the volume of the original one. The bottom of the base of the smaller pyramid has a content of 10 cm2. Find the area of the
• Roller Cylinder shell has the same content as one of its bases. Cylinder height is 15 dm. What is the radius of the base of the cylinder?
• Circular pool The base of the pool is a circle with a radius r = 10 m, excluding a circular segment that determines the chord length 10 meters. The pool depth is h = 2m. How many hectoliters of water can fit into the pool?

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Examples of area of plane shapes. Examples for 9th grade.