摘要：In the diagram, PQR is a straight line. ∠PQB=136.∠QRS=64.The value of ∠QSR is A.72 B. 44 C.58 D. 64 P Q R
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In the trapezium（梯形）ABCD，AD∥BC，point E is midpoint（中点）of the AD，point F is midpoint of the BC，EF=
（BC-AD），the result of the∠B+∠C is（ ）
| 1 |
| 2 |
| A、90° | B、100° |
| C、110° | D、120° |
As shown in the diagram（如图），the triangle PQR has PR=14cm and PQ=10cm．The side RQ produced meets the perpendicular PS at S，so that QS=5cm．The perimeter（周长） of triangle PQR is
In the figure1，ABCD is a diamond，points E and F lie on its sides AB and BC respectively，such that