Hình thang ABCD (AB//CD) tính các góc biết gócB và góc C tỉ lệ với 2;3 và góc A trừ góc D bằng 30 độ

answer: a. 74

step-by-step explanation:

it shows divided evenly, so add the 37+37 = 74

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

the solution is the point

step-by-step explanation:

we have

> equation a

> equation b

adds equation a and equation b

substitute the value of x in equation b to find the value of y

the solution is the point