To convert a temperature from Celsius to Fahrenheit, you can use the following formula:

°F = (°C × 9/5) + 32

So, to convert 77 degrees Celsius to Fahrenheit, we would plug 77 into the formula:

°F = (77 × 9/5) + 32

°F = (77 × 1.8) + 32

°F = 138.6 + 32

°F = 170.6

Therefore, 77 degrees Celsius is equal to 170.6 degrees Fahrenheit.