Find a counterexample to disprove each statement, or support with four examples. Every quadrilateral has at least two congruent sides

If every quadrilateral has at least two congruent sides, then an obtuse angle is an quadrilateral.

Step-by-step explanation:

A counterexample is basically the opposite of a conditional statement. So the Hypothesis is true but the conclusion is false. An obtuse triangle has different size sides and congruent sides means same size sides. Hope this helps Let me know if you need further explanation.

the circle graph is not a function.

step-by-step explanation:

the graph of the circle is not a function.

because for a graph to be a function, each value of x must give one value of y

in the circle, the values of x for -2< x< 2 each give 2 values of y.

hence this is not a function.

341

step-by-step explanation:

all you have to do is 9x31 (which equals 279) and then 20x31 (which equals 620). then you have to subtract. 620-279=341.