To make concrete, 2 parts cement is mixed with every 5 parts of sand. write down the ratio of cement to sand.

The answer would be 2:5 because there is 2 parts of cement and 5 parts of sand and they want to know the ratio of cement to sand

A ratio is simply comparing something and it compared the cent to the sand which is 2:5 or you can right it as 2 to 5 or 2/5 as a fraction

m∠5 + m∠3 = m∠1   is true.

m∠5 + m∠6 = 180 is true

m∠2 +m∠3 = m∠6   is true

m∠2 +m∠3 +m∠5 = 180   is true