Question

The points a b c and d lie on a straight line ab:bd = 1:4

Answer 1

The points a b c and d lie on a straight line ab:bd = 1:4 are A line that extends to infinity on both sides and has no curves is called a straight line.AB:BC=3:4.

What do you call a straight line?  

A line is simply an object in geometry denoted as an object with no width that extends on both sides. A straight line is just a line with no curves.

• AC=AB+BC=3+4=7;  AC:CD=2:1, i.e. AC=2;   because we get 2 different lengths for AC, we change the given ratio AC:CD to an equivalent one with AC=7 .
• As follows: AC:CD = 2 : 1 = 7 : 3.5 (multiply both sides by 3.5 )   Now we have AC:CD = 7 : 3.5 and AD = AC+CD= 7+3.5 = 10.5,, and the answer is: the ratio  BC:AD = 4:10.5.

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