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C, D

Step-by-step explanation:

C is correct because the triangle is symmetrical which makes "AC" and "CD" equal.

D is correct because "BCE" is also symmetrical which makes it easier to determine whether the triangle has 2 equal sides, which is does. "BC" and "CE."

Comments for Improvement Please

explanation:

infrared radiation has wavelength in the range between 700 nm and 1 mm. lets' convert these values into scientific notation, keeping in mind that:

let's start from the lower value, we have:

(we moved the dot two places to the left, so we increased the exponent by 2 units, from -9 to -7)

the higher value is:

so, the range of wavelength of infrared radiation is: