Identify the true statement. a. Two 100-year floods cannot occur in the same year (or in consecutive years).
b. A 200-year flood has a recurrence interval of, on the average, once every 200 years.
c. The size of a flood and its recurrence interval are inversely related; the larger the flood, the shorter its recurrence interval.
d. An annual probability of 4% means that there's a 1 in 4 chance that a flood of some given size will happen in any given year.

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

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