On occasion, you may see this formula written with r1 (radius 1 or semiminor axis) and r2 (radius 2 or semimajor axis) rather than a and b.
- Area = πr1r2
An ellipse is also called an oval and it is, essentially, an elongated circle. The distances from the center point to the side are not constant, which makes the formula for finding its area a little tricky.
To use this formula, you must know:
The sum of these two points does remain constant. That is why we can use the following formula to calculate the area of any ellipse.
- Area = πab
Area and Perimeter of a Triangle
- Diameter (d) = 2r
- Circumference (c) = πd or 2πr
To find out the triangle's area, you will need only the length of the base (b) and the height (h), which is measured from the base to the peak of the triangle. This formula works for any triangle, no matter if the sides are equal or not.
The triangle is one of the simplest shapes and calculating the perimeter of this three-sided form is rather easy. You will need to know the lengths of all three sides (a, b, c) to measure the full perimeter.
- Perimeter = a + b + c
- Area = 1/2 bh
Area and Circumference of a Circle
Similar to a sphere, you will need to know the radius (r) of a circle to find out its diameter (d) and circumference (c). Keep in mind that a circle is an ellipse that has an equal distance from the center point to every side (the radius), so it does not matter where on the edge you measure.
These two measurements are used in a formula to calculate the circle's area. It's also important to remember that the ratio between a circle's circumference and its diameter is equal to pi (π).
- Area = πr2
Escape velocity is the minimum speed needed for an object to break free from the gravitational pull of a planet or other massive body without further propulsion.
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Lysol Disinfectant Spray, Crisp Linen, 19 oz, 3-count
Lysol Disinfectant Spray, Crisp Linen, 19 oz, 3-count
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Features:
- Tested and proven to Kill COVID-19 Virus (Kills SARS-CoV-2 on hard, non-porous surfaces in 2 minutes), EPA Reg #777-99
- Helps protect you and your family from harmful germs
- Use to disinfect frequently touched household surfaces like doorknobs, diaper pails, remote controls and light switches
- Disinfectant spray with Clean Linen scent
Product Details:
EPA #777-99. Lysol disinfecting spray helps protect your family and helps keep them healthy. Our products are designed to provide germ protection and can kill 99.9% of viruses and bacteria on hard surfaces, when used as directed. From counters to couches, you can depend on Lysol to kill 99.9 percent of bacteria. This spray eliminates odors and kills 99.9 percent of mildew & mold on most household surfaces. Sanitizes soft surfaces and deodorizes the air. Pre-clean surfaces prior to use. Hold can upright 6"" to 8"" from surface. Spray 3 to 4 seconds until covered with mist. To Disinfect: Surfaces must remain wet for 3 minutes then allow to air dry. For Norovirus surfaces must remain wet for 10 minutes then allow to air dry. Rinse toys and food contact surfaces with potable water after use.
- DISINFECTANT SPRAY KILLS 99.9% OF VIRUSES AND BACTERIA: Lysol Disinfectant Spray is tested and proven to kill 99.9% of viruses and bacteria, including COVID-19/Coronavirus* (when used as directed); EPA Reg #777-99.
- ANTIBACTERIAL BLEACH-FREE DISINFECTANT : this Lysol disinfecting product should work as hard as you do; this household disinfectant kills over 100 illness causing germs, including cold and flu viruses.** (**when used as directed).
- DISINFECTING SPRAY FOR GERMS: This disinfecting spray eliminates messes and 99.9% of germs and odor causing bacteria.
- SANITIZING SPRAY FOR HARD AND SOFT SURFACES : This fast-acting spray disinfects hard non-porous contact surfaces and sanitizes surfaces.
- LEADERS IN DISINFECTION: Looking for some of our other best household disinfectant cleaning products? Try Lysol Disinfectant Cleaning Wipes, Lysol All Purpose Cleaners, and Lysol Bathroom Cleaners (packaging may vary).
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