[填空题]
The distance between two points with coordinam v kg14 crq14; h 8/wyp75spdsaihmh8tolj:zhd5w) zj/3-8 zb g :tkvfes (x$_1$,y$_1$) and (x$_2$,y$_2$) is equal to
$\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$.
1.Calculate the distance between points A(40,−100) and B(1,−2). Give your answer correct to three significant figures.
The distance between points A(40,−100) and B(1,−2) is AB≈ .
2.Give your answer from part (a) correct to one decimal place.The number= .
3.Write the answer to part (b) in the form a×10$^k$, where 1≤a<10, k∈Z.The number= ×104$^2$
