What is the constant of proportionality what does it mean
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The constant of proportionality is the ratio between two directly proportional quantities. Two quantities are directly proportional when they increase and decrease at the same rate.

The constant of proportionality k is given by k=y/x where y and x are two quantities that are directly proportional to each other. Once you know the constant of proportionality you can find an equation representing the directly proportional relationship between x and y, namely y=kx, with your specific k.

There is no proportion when x and y are interacting together.

For example, when you have a proportion like y=x+2, you will have a straight line on the graph. But when you have something like y=xy, you will get a curved line on the graph which does not fulfill the rule that a proportional relationship should be graphed as a line.

Hope this helps!

Step-by-step explanation:

The constant of proportionality is the ratio between numbers that expresses the rate at which the numbers increase or decrease. These two numbers are directly proportional when they increase and decrease at the same rate.

m∠a is 90°

m∠b is 40°