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南外几何讲解-简单
周长问题The adjacent sides of the decagon(十边形) shown meet at right angles and all dimensions(尺寸)are in metres.What is the perimeter, in metres, of this decagon?An L-shaped path is 5m wide and has an area of 125m2.The perimeter, in metres, of the figure is?A square piece of paper is folded in half. The resulting rectangle has a perimeter of 18 cm. What is the area, in square centimetres, of the original square?The perimeter of the equilateral trianglePQR is 48 cm.What is the perimeter, in centimetres, ofthe parallelogram PSTU?Nelly correctly measures three sides of a rectangle and gets a total of 88 cm. HerBrother. Raffy correctly measures three sides of the same rectangle and gets a total of80 cm. What is the perimeter of the rectangle, in cm?Four points P, Q, R and S are such that PQ = 10, QR = 30, RS = 15 andPS = m. If m is an integer and no three of these points lie on a straight line, whatis the number of possible values of m?A shape is formed when a regular hexagon of side 9 cm has six regular hexagons of side 3 cm added to the outside of it with one at the centre of each side (two of the sides are shown).What is the perimeter, in centimetres, of the shape?等高In a right-angled triangle ACD, the area of shaded region is 10 cm2, as shown in thefigure below. AD = 5 cm, AB = BC, DE = EC. Find the length of AB.In rectangle ABCD, AB = 12 and AD = 5. Points P, Q,R and S are all on diagonal AC, so that AP = PQ = QR = RS = SC. What is the total area of the shaded region?角In the diagram, the size of three angles are given. Find the value of x.In the diagram, PQRS is a square.The value of x isIn the following figure, if CA = CE, what is the value of x?In triangle ABC, AP = AQ and BQ = BR. Determine angle PQR, in degrees.This sheriff’s badge(司法徽章) has ten equal sides, five 60? angles and five equal reflex angles.The value of x is勾股定理The area of square ABCD is 64 and AX=BW=CZ=DY=2. What is the area of square WXYZ?A rectangle with a length of 60 and a width of 45 can be divided(分
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