base of an isosceles triangle什么意思

英语翻译
1.Two angles of an isosceles triangle measure 70°andⅩ°.What is the sum of the three possible values of
2.Andy and Bethany have a rectangular array of numbers with 40 rows and 75 columns.Andy adds the numbers ineach row.The average of his 40 sums is A.Bethany adds the numbers in each colunm.The average of her 75 sums is B.What is the value of A／B?
3.How many whole numbers between 1 and 1000 do not contain the digit
4.On the last day of school,Mrs.Wonderfui gave jelly beans to her class.She gave each boy as many jelly beans as three were boys in the class.She gave each girl as many jelly beans as there were girls in the class.She brought 400 jelly baens,and when she finished,she had six jelly beans left.There were two more boys than girls in her class.How many students were in her class?
5.The letters A,B,Cand D all represent digits.what digit does D represent?
6.On a checkerboard composed of 64 unit squares,what is the probability that a randomly chosen unit square does not touch the outer edge of the board?
7.A one-cubic-foot cube is cut into four pieces by three cuts parallel to the top face of the cube.The first cut is ½ foot from the top face.The second cut is 1／3 foot below the first cut,and the third cut is 1／17 foot below the second cut.From the top to the bottom the pieces are labeled A,B,C and D.The pieces are then glned together end to end in the order C,B,A,D to make a long solid as shown below.What is the total surface area of this solid in square feet?

The length of each leg of an isosceles right triangle is 40.9 cm.Find the length of the hypotenuse to the nearest tenth

the perimeter of a certain isosceles right triangle is 16 + 16根号2,what is the length of the hypotenuse of the triangle?
选项是8,16,4根号2,8根号2,16根号2
我觉得是D啊,怎么想怎么不对
好像斜边我算成直角边了。知道了知道了

英语翻译
one of the equal sides of an isosceles triangle is 3m less than twice its base.the perimeter is 44m.find the length of the side.

回答这个问题,要画图!
An exterior angle at the base of on isosceles taiangle measures 130°.find the measure of the vertex angle.