Cho hình chóp sabcd có đáy abcd là hình thoi tâm o . sb vuông góc abcd khẳng định nào sai ?
a. sc vuông góc bd
b. sa oc
c. sobd
d. bcsb

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

An office supply company conducted a survey before marketing a new paper shredder designed for home use. in the survey, 80 % of the people who tried the shredder were satisfied with it. because of this high satisfaction rate, the company decided to market the new shredder. assume that 80 % of all people are satisfied with this shredder. during a certain month, 100 customers bought this shredder. find the probability that of these 100 customers, the number who are satisfied is 69 or fewer.

The map shows the location of the airport and a warehouse in a city. though not displayed on the map, there is also a factory 112 miles due north of the warehouse.a truck traveled from the warehouse to the airport and then to the factory. what is the total number of miles the truck traveled?