Find the Area 找面积A rectangular sheet of christmas wrapping paper measures 2.8 m by 50 cm. A triangle with side lengths of 23 cm, 19 cm and 25 cm is cut from the paper. How much paper is left?

一道数学题,用到初级微积分A right circular cylinder is inscribed in a sphere of radius r.Find the lagest possible surface area of such a cylinder. Find the Area 找面积A rectangular sheet of christmas wrapping paper measures 2.8 m by 50 cm. A triangle with side lengths of 23 cm, 19 cm and 25 cm is cut from the paper. How much paper is left? 英语翻译Find the circumference of a circular disk whose area is 100pi square centimeters A sheet of tin is cut so as to form a circular ring that has an area of 18 square inches.The total outer and inner perimeters of the ring measure 36 inches.Find the inner radii and the outer radii of the ring.Use area of circle=派r^ circumference=2 Find the area of the given figure.翻译 Find the area of a triangle with sides of 66.9 and 78.9 centimeters,and the included angle of 37.9 Find the volume.Find the volume and surface area of a right prism of height 20 cm whose base is a square of side 15 cm. find the controller you lost in this area.现在就要! 英文微积分题目Let R be the smaller of the two regions enclosed by the elipse 144x^2+16y^2=2304 and the line x=2^(3/2) . Find the area of the region R. A room is 6m long,5m wide and 3m high.If the total area of the door and windows is 4平方米,find the total area of the walls inside the room? A room is 6m long,5m wide and 3m high.If the total area of the door and windows is 4平方米,find the total area of the walls inside the room? three circles of equal radius r are pairwise tangent.find the area of the shape which is contained by the arcs of the circles which start and end at the points of tangent.Thank you. 请问一道英语数学题的答案?A rectangular box without a lid has volume 0.5 cubic metres.Find the minimum surface area.请问答案是什么? 请教一道英文数学题?题目如下:A rectangular box without a lid has volume 0.5 cubic metres. Find the minimum surface area. 急!懂英语和数学的来啊!The length and width of a rectangle are 12cm and 5cm respectively. If the length is increased by 50% and the width is decreased by 20%.(a)Find the original area of the rectangle.(b)Find the new area of the rectangle.(c the area of怎么用?翻译中国领土面积960万平方千米,用上the area of the width of a rectangle is 7 cm shorter than the length .if the perimeter of the rectangle is 38 cm ,find(a) the width(b) the length(c) the area of the rectangle C语言 求圆面积#include stdio.hmain(){double r,area;printf(input r please(r>0));scanf(%f ,&r);area=3.1416*r*r;printf(r=%6.2f ,r);printf(area=%d ,area);}这是改完后的书上写的是main(){float r,area;printf(input r please(r>0)