An isotonic contraction can be concentric, which is where the muscle shortens as the fibres contract or eccentric, where the fibres contract as the muscle lengthens. When a muscle contracts with no resulting movement, it is an isometric contraction. Page: 1  1. 2  2.
To determine how much paint your house needs, measure the house's perimeter. Then multiply that figure by the height, excluding gable ends. Take the measurements with a steel tape measure, or reel out a ball of twine around the house and mark and measure the twine.
For example, assume the house is 2,000 square feet. Determine the cost of painting the house. Your painter will give you this number based on his material and labor cost. For example, assume a price of $1,200. Divide the cost by the square footage to find cost per square foot. For example, $1,200 divided by 2,000 square feet equals $0.60 per square foot.